Abstract
A novel host material featuring the characteristics of bipolarity and thermally activated delayed fluorescence, 10-(4-(5,5-dimethylbenzofuro[3,2-c]acridin-13(5H)-yl)phenyl)-10-phenylanthracen-9(10H)-one (DphAn-5BzAc), has been designed and synthesized. By employing this material as the host of green emitter Ir(ppy)2acac, we have fabricated phosphorescent organic light-emitting diodes (PhOLEDs) with two hosting schemes, which are the single host system consisting of DhAn-5BzAc and the co-host system with 1,3-bis(carbazolyl)benzene (mCP). We found that the co-host based PhOLED achieved very low energy consumption values at high brightnesses, which were only 0.5, 5.9 and 94.0 mW m−2 at 100, 1000 and 10 000 cd m−2, respectively. The extremely low energy consumption for DhAn-based PhOLEDs were attributed to the excellent bipolar transport properties and thermally activated delayed fluorescence characteristics.
Highlights
Organic light-emitting devices (OLEDs) have attracted intense interest due to the advantages of exibility, high efficiency and eco-friendliness in the elds of full-color at panel displays and solid-state lighting.[1,2,3] OLED displays show considerable advantages over the tranditional displays in energy consumption
The low energy level barrier, balanced carrier transport, efficient host–guest system restrict the realization of low power consumption OLEDs,[4,5,6] which are characterized with low turnon voltage, high efficiency and importantly, reduced efficiency roll-off at high brightness
The balanced carrier transportation and minimization of carrier trapping by dopants by mixing two hosts are of great bene cial to phosphorescent organic light-emitting diodes (PhOLEDs)
Summary
Organic light-emitting devices (OLEDs) have attracted intense interest due to the advantages of exibility, high efficiency and eco-friendliness in the elds of full-color at panel displays and solid-state lighting.[1,2,3] OLED displays show considerable advantages over the tranditional displays in energy consumption. By mixing 1,3-bis(carbazolyl)benzene (mCP) and new materials as the host with better bipolar host material to ensure good carrier transport capability, the DphAn-5BzAc based co-host device revealed excellent performance and extremely low energy consumption with 0.5, 5.9 and 94 mW mÀ2 at 100, 1000 and 10 000 cd mÀ2, respectively. Yellow power (4.2 g) and benzene (20 g) were stirred in a three-necked ask under a nitrogen atmosphere, boron tri uoride diethyl etherate (0.08 g, 0.5 mmol) was slowly dropwised. Paper cooling to room temperature, the solution was extracted with ethyl acetate and distilled water. The devices were fabricated using conventional vacuum deposition of the organic layer and cathode onto an indiumtin-oxide (ITO) coated glass substrate under a base pressure lower than 5.0 Â 10À5 mbar. The luminance and spectra of each device were measured in the direction perpendicular to the substrate
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